Undulated cylinders of charged diblock copolymers

Details Undulated cylinders of charged diblock copolymers Undulated cylinders of charged diblock copolymers

2006-05-02

arxiv.org/abs/cond-mat/0605076v2

Eur. Phys. J. E 20, 335 (2006)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1140/epje/i2006-10025-1

We study the cylinder to sphere morphological transition of diblock copolymers in aqueous solution with a hydrophobic block and a charged block. We find a metastable undulated cylinder configuration for a range of charge and salt concentrations which, nevertheless, occurs above the threshold where spheres are thermodynamically favorable. By modeling the shape of the cylinder ends, we find that the free energy barrier for the transition from cylinders to spheres is quite large and that this barrier falls significantly in the limit of high polymer charge and low solution salinity. This suggests that observed undulated cylinder phases are kinetically trapped structures.

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